linux-imx

/*

 * Marvell Orion SoC timer handling.

 *

 * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>

 *

 * This file is licensed under the terms of the GNU General Public

 * License version 2.  This program is licensed "as is" without any

 * warranty of any kind, whether express or implied.

 *

 * Timer 0 is used as free-running clocksource, while timer 1 is

 * used as clock_event_device.

 */

​

#include <linux/kernel.h>

#include <linux/bitops.h>

#include <linux/clk.h>

#include <linux/clockchips.h>

#include <linux/delay.h>

#include <linux/interrupt.h>

#include <linux/of_address.h>

#include <linux/of_irq.h>

#include <linux/spinlock.h>

#include <linux/sched_clock.h>

​

#define TIMER_CTRL      0x00

#define  TIMER0_EN      BIT(0)

#define  TIMER0_RELOAD_EN   BIT(1)

#define  TIMER1_EN      BIT(2)

#define  TIMER1_RELOAD_EN   BIT(3)

#define TIMER0_RELOAD       0x10

#define TIMER0_VAL      0x14

#define TIMER1_RELOAD       0x18

#define TIMER1_VAL      0x1c

​

#define ORION_ONESHOT_MIN   1

#define ORION_ONESHOT_MAX   0xfffffffe

​

static void __iomem *timer_base;

​

static unsigned long notrace orion_read_timer(void)

{

    return ~readl(timer_base + TIMER0_VAL);

}

​

static struct delay_timer orion_delay_timer = {

    .read_current_timer = orion_read_timer,

};

​

static void orion_delay_timer_init(unsigned long rate)

{

    orion_delay_timer.freq = rate;

    register_current_timer_delay(&orion_delay_timer);

}

​

/*

 * Free-running clocksource handling.

 */

static u64 notrace orion_read_sched_clock(void)

{

    return ~readl(timer_base + TIMER0_VAL);

}

​

/*